irb `RDoc::RI::Driver::NotFoundError`

gistfile1.txt

$ irb
irb(main):001:0> help

Enter the method name you want to look up.
You can use tab to autocomplete.
Enter a blank line to exit.

>> \q
RDoc::RI::Driver::NotFoundError: \q
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:921:in `block in expand_class'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:909:in `each'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:909:in `inject'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:909:in `expand_class'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:940:in `expand_name'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:1091:in `block in interactive'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:1081:in `loop'
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rdoc-4.1.1/lib/rdoc/ri/driver.rb:1081:in `interactive'
        from (irb):1
        from /Users/d6rkaiz/.rbenv/versions/2.1.2/bin/irb:11:in `<main>'
irb(main):002:0>